This has been easily the most obnoxious change of iOS 11. It is super annoying to have to dismiss the list of available WiFi networks every single time I open my phone while walking around the city, no matter how many times I turn my WiFi off.
This change might be inconvenient for you personally, but I suspect there's no way in hell Apple would have made this change if they didn't have robust data on the way their average customer uses their device and didn't believe that this was a positive change.
Five words isn't much beyond a simple toggle. :)